Validation of MR-based polymer gel dosimetry as a preclinical three-dimensional verification tool in conformal radiotherapy

Yves De Deene*, C. De Wagter, B. Van Duyse, S. Derycke, B. Mersseman, W. De Gersem, T. Voet, E. Achten, W. De Neve

*Corresponding author for this work

Research output: Contribution to journalArticle

102 Citations (Scopus)

Abstract

The aim of this work was to investigate MR-based polymer gel dosimetry as a three-dimensional (3D) dosimetry technique in conformal radiotherapy. A cylindrical container filled with polymer gel was placed in a water-filled torso phantom to verify a treatment plan for the conformal irradiation of a mediastinal tumor located near the esophagus. Magnetic resonance spin-spin relaxation rate images were acquired and, after calibration, converted to absorbed dose distributions. The dose maps were compared with dose distributions measured using radiographic film. The average root-mean-square structural deviation, for the complete dose distribution, amounted to less than 3% between gel and film dose maps. It may be expected that MR gel dosimetry will become a valuable tool in the verification of 3D dose distributions. The influence of imaging artifacts arising from eddy currents, temperature drift during scanning, and B1 field inhomogeneity on the dose maps was taken into account and minimized.

Original languageEnglish
Pages (from-to)116-125
Number of pages10
JournalMagnetic Resonance in Medicine
Volume43
Issue number1
DOIs
Publication statusPublished - 2000
Externally publishedYes

Keywords

  • Conformal radiotherapy
  • Intensity-modulated radiotherapy (IMRT)
  • MR gel dosimetry
  • Polymer gel
  • Quantitative T imaging

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